The Women's Health Initiative (WHI) trial of HRT in 2002 stopped early because cancer risks and heart disease were found while taking the treatment.
The Times reported that the same team conducted a follow-up study to 2005 monitoring 15,730 women with an average age of 63, originally included in the trial. The women were randomised to take either the combined HRT pill or placebo. The study found that three years after stopping the treatment, the risk of breast cancer was significantly higher than the placebo group, but other risks such as blood clots and strokes, return to normal after the women stopped taking the pills.
The research team pointed out that the findings should be interpreted with caution and suggested that to reduce the cancer risks, HRT should be used at the minimum effective dose and for the shortest possible time. The study was published in JAMA.
Source: "Health Risks and Benefits 3 Years After Stopping Randomized Treatment With Estrogen and Progestin" - JAMA. 2008;299(9):1036-1045 ( full text via Athens)
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